Table 6. Weight Loss Incurred by Each Test Panel" 



Method of Exposure 



Test Panels 



Weight Loss 



(gm) for — 











23 Days' Exposure 



43 Days' Exposure 



Carbon Steel 



Control in initially sterile 



1 



0.1338 



0.1539 



cylinder covered with a 



2 



0.1338 



0.1472 



membrane filter 









Placed inside cylinder with 



1 



0.2603 



0.4006 



ends covered with nylon screen 



2 



0.2315 



0.3020 



Placed inside cylinder with 



1 



1.0204 



1.2752 



ends left open 



2 



0.8707 



1.0997 





1 



1.5545'' 



1.9617'' 



Exposed on plastic strip 



2 



1.5546'' 



1.0190" 





Aluminum 



Alloy 





Control in initially sterile 



1 



0.0224 



0.0484 



cylinder covered with a 











2 



0.0233 



0.0553 



membrane filter 









Placed inside cylinders with 



1 



0.0329 



0.0565 



ends covered with nylon 







2 



0.0346 



0.0741 



screen 









Placed inside cylinders with 



1 



0.2951 



0.4195 



ends left open 



2 



0.2501 



- 





1 



0.5300'' 



0.7783'' 



Exposed on plastic strip 



2 



0.4764'' 



0.7307'' 



" Specimen dimensions: 1 x 3 inches, 

 fc Specimen dimensions: 1x6 inches. 



40 



